2. 外语
  3. The passage is chiefly about ______. The deep-sea listening system makes use of______.

The passage is chiefly about ______. The deep-sea listening system makes use of______.

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问题 The passage is chiefly about ______.
The deep-sea listening system makes use of______.
选项 A、the sophisticated technology of focusing sounds under water
B、the capability of sound to travel at high speed
C、the unique property of layers of ocean water in transmitting sound
D、low-frequency sounds traveling across different layers of water
答案C
解析
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